Wellfleet Lifeguards said the spine had probably been buried under the sand "for quite some time" before it was exposed by Hurricane Teddy.
Over the past decade, the waters off Cape Cod have become one of the world's great white shark hotspots.
The image, showing an up-close glimpse of the apex predator swimming through clear water, was published to Twitter by the Atlantic White Shark Conservancy this week.
The Cape Cod region has seen a steady increase of great white shark sightings over the last decade, according to the Atlantic White Shark Conservancy's website.
The Massachusetts Division of Fisheries and Wildlife has seen a dramatic uptick in newly documented eagle nests this year.
The whales were observed in the Northeast Canyons and Seamounts Marine National Monument, located around 130 miles east-southeast of Cape Cod, Massachusetts.
For the second time in two years the species of shark got close to Massachusetts shark expert Greg Skomal.
Data from OCEARCH has shown that the Atlantic continental shelf waters off the coasts of North Carolina, South Carolina, Georgia and Florida are a winter "hot spot" for white sharks.
The study is the latest to find that climate change is bad news for penguins.
The seal attack on Saturday marked the fourth time a shark has been spotted at Nauset Beach, leading to the closure.
"We saw some more splashing of water, and then the blood started spreading out more," said a witness.
A fellow passenger captured the incredible moment the shark leaped at their boat.
Police are investigating the legs, but aren't yet sure if any laws have been broken.
The video was captured by a team of researchers from the non-profit Atlantic White Shark Conservancy.
The man denied the charge of open and gross lewdness.
"It doesn't feel like I did anything heroic," the survivor said. "A lot of this was luck."